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5.4.2 Chlorofluorocarbons LO: I understand the structure and properties of CFCs

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Chlorofluorocarbons are based on alkane molecules where the hydrogens have been replaced by a mixture of chlorine and fluorine. dichlorodifluoromethane neutral insoluble unreactive non-flammable easily liquefied long lastingpropellant refrigerant LO: I understand the structure and properties of CFCs

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CFCs were used as refrigerants instead of ammonia and sulphur dioxide which are. CFCs were used as propellants instead of propane and as they were not as dangerous (non- flammable). The use of CFCs was banned when it was discovered that they destroy. LO: I understand the structure and properties of CFCs toxic butane ozone

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5.4.3 Ozone LO: I understand how CFCs cause a problem for the ozone layer.

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Ozone provides a protective layer around the Earth against the damaging effects of radiation. UV radiation for the sun is responsible for the formation of in the upper atmosphere: O2O2 uv OO+ O2O2 O3O3 O+ UV radiation also splits CFCs in the upper atmosphere to produce atoms. Chlorine atoms react with, destroying it. LO: I understand how CFCs cause a problem for the ozone layer. (ozone) uv ozone chlorine ozone